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use std::io::{self, Read, Write};
pub trait Sink {
fn put<V: Ser>(&mut self, value: V) -> io::Result<()>;
}
pub trait Source {
fn get<V: Ser>(&mut self) -> io::Result<V>;
}
impl<T: Write> Sink for T {
fn put<V: Ser>(&mut self, value: V) -> io::Result<()> {
value.write(self)
}
}
impl<T: Read> Source for T {
fn get<V: Ser>(&mut self) -> io::Result<V> {
V::read(self)
}
}
pub trait Ser: Sized {
fn write(&self, sink: &mut impl Write) -> io::Result<()>;
fn read(source: &mut impl Read) -> io::Result<Self>;
}
impl<A: Ser, B: Ser> Ser for (A, B) {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
self.0.write(sink)?;
self.1.write(sink)?;
Ok(())
}
fn read(source: &mut impl Read) -> io::Result<Self> {
Ok((A::read(source)?, B::read(source)?))
}
}
impl<A: Ser, B: Ser, C: Ser> Ser for (A, B, C) {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
self.0.write(sink)?;
self.1.write(sink)?;
self.2.write(sink)?;
Ok(())
}
fn read(source: &mut impl Read) -> io::Result<Self> {
Ok((A::read(source)?, B::read(source)?, C::read(source)?))
}
}
impl<A: Ser, const N: usize> Ser for [A; N] {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
for e in self {
e.write(sink)?;
}
Ok(())
}
fn read(source: &mut impl Read) -> io::Result<Self> {
let mut k: [A; N] = unsafe { std::mem::zeroed() };
for i in 0..N {
k[i] = A::read(source)?;
}
Ok(k)
}
}
impl<T: Ser> Ser for Vec<T> {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
self.len().write(sink)?;
for e in self {
e.write(sink)?;
}
Ok(())
}
fn read(source: &mut impl Read) -> io::Result<Self> {
let mut v = vec![];
for _ in 0..usize::read(source)? {
v.push(T::read(source)?)
}
Ok(v)
}
}
impl Ser for u8 {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
sink.write_all(&[*self])
}
fn read(source: &mut impl Read) -> io::Result<Self> {
let mut buf = [0u8; 1];
source.read_exact(&mut buf)?;
Ok(buf[0])
}
}
impl Ser for u16 {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
sink.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 2]>(self) })
}
fn read(source: &mut impl Read) -> io::Result<Self> {
let mut buf = [0u8; 2];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for u32 {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
sink.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 4]>(self) })
}
fn read(source: &mut impl Read) -> io::Result<Self> {
let mut buf = [0u8; 4];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for u64 {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
sink.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
}
fn read(source: &mut impl Read) -> io::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for usize {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
sink.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
}
fn read(source: &mut impl Read) -> io::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for f32 {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
sink.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 4]>(self) })
}
fn read(source: &mut impl Read) -> io::Result<Self> {
let mut buf = [0u8; 4];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for f64 {
fn write(&self, sink: &mut impl Write) -> io::Result<()> {
sink.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
}
fn read(source: &mut impl Read) -> io::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
|
